Cone Pieces
Shop Bong Cone Pieces from Billy Mate, including glass cone pieces, traditional brass bucket cones and specialty designs in a range of joint sizes and fittings. Find replacement cones for glass stem bongs, Australian bonza stem setups and compatible water pipes, with options including 10mm, 14mm, 18mm, 19mm and bonza-style fittings.
A bong cone piece is the removable component that fits into the stem, downstem or joint of a compatible bong or water pipe.
Billy Mate offers cone pieces in different materials, sizes, shapes and connection systems, making it important to match the cone correctly to your bong.
Depending on the setup, a bong may use:
- Glass cone piece
- Brass bucket cone
- Bonza-style cone
- Specialty glass cone
- Multi-cone or shooter-style attachment
- Built-in cone system
The most important thing when choosing a replacement cone piece is compatibility.
A 14mm glass cone piece, for example, is designed for a compatible 14mm female glass joint and will not fit the same way as a traditional brass bucket used with an Australian metal bonza stem.
The cone piece sits at the beginning of the bong's airflow path.
Depending on the bong design, it may fit directly into:
- A glass downstem
- A built-in glass joint
- A slider stem
- An adapter
- A metal bonza stem
Most cone pieces are removable, which makes them easier to clean, replace or change when required.
Although many designs perform the same basic function, their connection systems can be completely different.
That is why joint size, cone style and stem type should always be checked before purchasing.
Glass cone pieces are commonly used with modern glass-on-glass bongs and water pipes.
They feature a ground glass joint designed to sit inside a matching female connection.
Glass cone pieces are available in various:
- Joint sizes
- Bowl shapes
- Depths
- Handle styles
- Colours
- Decorative designs
Some include a small glass handle that makes the cone easier to grip when removing it from the joint.
Glass cone pieces are particularly common with removable glass downstem setups.
For example:
18/14mm downstem + 14mm glass cone piece
In this setup, the downstem fits the larger bong joint while the cone piece fits the smaller 14mm opening at the top.
The brass bucket cone piece is closely associated with the traditional Australian bonza bong setup.
Instead of using a ground glass joint, the brass cone fits into a compatible metal stem.
A typical Australian setup may include:
Bong → Silicone or Rubber Grommet → Metal Bonza Stem → Brass Bucket Cone
This construction is commonly found on:
- Acrylic bongs
- Traditional Australian glass bongs
- Bubble bongs
- Rubber base water pipes
- Some silicone bongs
Brass cones and glass cones use different connection systems, so they should not be treated as interchangeable simply because the bong is similar in size.
Cone pieces come in several sizes.
Common glass joint sizes include:
10mm
A compact joint size commonly found on smaller glass pieces and specialised setups.
14mm
One of the most common sizes across modern glass bongs and accessories.
You may also see this referred to as approximately 14.5mm depending on the manufacturer.
18mm
A larger glass joint used on some bongs, stems and accessories.
19mm
Another commonly used larger joint designation.
Some manufacturers may refer to approximately 18.8mm or 19mm depending on the measurement convention being used.
Bonza / Grommet Fit
Traditional Australian bonza cone pieces do not use the same ground-glass joint system.
These need to be matched to the appropriate metal stem.
The individual Billy Mate product listing should always state the connection size or style clearly.
Two sizes customers will commonly encounter are 14mm and 19mm.
A 14mm cone must be used with a compatible 14mm connection.
Likewise, a larger 19mm cone requires a compatible larger joint.
The physical appearance of two glass cone pieces may be similar, but even a small difference in joint diameter can prevent the component from fitting correctly.
Before replacing a cone piece, check:
- Existing cone size
- Downstem size
- Bong joint size
- Joint gender
- Connection type
If the existing downstem is marked 18/14mm, for example, it will generally accept a compatible 14mm cone piece at the top.
Glass bong joints also have a gender.
Male Joint
The ground glass section inserts into a female opening.
Many standard glass cone pieces use this style.
Female Joint
The opening receives a compatible male component.
Why It Matters
Size alone is not enough.
A component must have both the correct diameter and correct joint configuration to fit properly.
For example, simply knowing that your bong uses 14mm components does not automatically guarantee compatibility if the joint configuration is different.
Billy Mate cone pieces may be available in several materials depending on the product.
One of the most common options for glass-on-glass bongs.
Glass allows for simple clear designs as well as coloured, branded and decorative versions.
Commonly used for traditional Australian bucket-style cone pieces and bonza stem setups.
Some specialised cone pieces may use lightweight metal construction.
Ceramic may appear in specialised or decorative cone designs.
Different materials use different connection systems, so customers should select by fit first, material second.
Not every cone piece looks the same.
Designs can vary in:
- Bowl depth
- Bowl width
- Handle shape
- Joint length
- Glass thickness
- Colour
- Branding
- Decorative styling
Some customers prefer a simple clear glass cone, while others want a coloured or branded piece that matches the rest of their bong.
The shape of the bowl should not be confused with the joint size.
Two 14mm cones can have very different bowl shapes while still using the same connection size.
Many glass cone pieces include a small built-in handle.
The handle provides a dedicated point to grip the cone piece rather than handling the bowl itself.
Handles can also become part of the visual design, with options ranging from simple clear glass tabs to coloured and decorative shapes.
A handle does not normally change joint compatibility, so customers should still choose according to the actual joint size.
Billy Mate also carries more unusual cone piece and multi-connection designs.
These may include specialty attachments that hold multiple cones or compatible rolled products at the same time.
For example, some Billy Mate multi-shooter designs use several outer positions together with a central joint, creating a completely different setup from a standard single cone piece.
Specialty cone pieces should always be checked carefully for:
- Main joint size
- Number of positions
- Centre connection size
- Compatible accessories
- Overall weight
- Clearance around the bong
These pieces are designed as specialty accessories rather than direct replacements for every standard cone.
The cone piece and downstem are two separate components.
Cone Piece
The upper removable component.
Downstem
The longer component that extends from the bong joint toward or into the water chamber.
A common glass setup looks like:
Bong → Downstem → Cone Piece
For example:
18mm bong joint → 18/14mm downstem → 14mm cone piece
Understanding the difference between the two makes finding replacement parts much easier.
A metal bonza stem uses a different setup from a modern glass downstem.
A typical bonza system contains:
Bong Body → Grommet → Metal Stem → Brass Bucket Cone
When replacing a cone for this style of bong, customers should look for a compatible bonza or brass bucket cone piece rather than selecting a glass cone based only on millimetre size.
This distinction is especially important for traditional Australian water pipes.
Finding the correct replacement is easier when you check a few basic things.
1. Check Your Stem Type
Is it:
- Glass downstem
- Built-in glass joint
- Slider stem
- Metal bonza stem
2. Check the Joint Size
For glass systems, determine whether you need:
- 10mm
- 14mm
- 18mm
- 19mm
3. Check the Connection Style
Determine whether the component uses:
- Ground glass joint
- Bonza / metal stem fit
- Another specialised connection
4. Check Joint Gender
Make sure the new cone matches the receiving joint.
5. Choose Your Material and Design
Once compatibility is confirmed, choose between available glass, brass, metal or decorative options.
Fit first. Style second.
Because cone pieces are removable on many bong designs, they can usually be cleaned separately from the main bong.
Regular cleaning helps remove residue that may accumulate around:
- The bowl
- Airway
- Ground glass joint
- Handle
- Stem connection
If a glass cone becomes damaged or chipped around the joint, replacement is generally a better option than continuing to use damaged glass.
Billy Mate also carries compatible bong cleaning products and replacement components for maintaining different water pipe setups.
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